Method of making wrist pins



Jam., Mfg 393@ F H. BANNER 2?@279573 METHOD OF MAKING WRIST PINSOriginal Filed May 5, 1923 Patented Jan. 14, 1936 UNITED STATS PATENTOFFIQE METHOD OF MAKNG WRIST PINS Original application May 3,

1928, Serial No.

274,932. Patent No. 1,876,550, dated September 13, 1932.

Divided and this application July 19, 1932, Serial No. 623,382

2 Claims.

This invention relates in general to wrist pins, and has more particularreference to wrist pins furnished with lubricating means and having thebody and head formed of separate pieces of material.

The present application is a division of the application of Frank I-I.Banner, Serial No. 274,932 filed May 3, 1923, now Patent 1,876,550granted September 13, 1932.

The wrist pins forming the subject matter of the present invention canbe used in any usual or desired connection such, for example, as formingan axle on which is mounted a rockable lever, or for connecting a crankarm to a connecting rod, etc.

In order to lessen the cost of manufacture it is desirable to form thewrist pin with a separate head, connected to the body, as in this mannerthe body can be formed from stock having the dimensions of the nishedpin body, and thus avoid such machining. In connecting the head to thebody, after a lubricating duct is formed in the body, the connectionbetween the body and the head must be at such a point as to prevent thelubricating duct from weakening the connection. 1

At the same time it is most desirable toform a very rugged and durableconstruction, cheap to manufacture, simple in form, and long lived inservice.

With the above and other objects in View it is proposed, in accordancewith this invention, to form a wrist pin from cylindrical stock havingthe diameter oi the body of the finished pin, a peripheral groove beingformed in the body near one end and a projecting ring being positionedin the groove to form a head for they wrist pin. The connection betweenthe head and the body thus is spaced from the longitudinal axis of thebody whereby not to be interfered with by a lubricating duct formed inthe longitudinal axis of the body.

The head can be formed of a ring of stock having either rectangular orcylindrical cross section; can be iirst formed into a split ring andthen sprung into the groove; and nally, the ends of the ring can be spotwelded in place, if desired, to make a continuous ring.

Further objects, purposes and characteristic features of the inventionwill appear as the description progresses, reference being had to theaccompanying drawing, showing, solely by way of illustration, and in nomanner in a limiting sense, several forms which the invention canassume. In the drawingz Fig. 1 isv a side elevation of a piece of stockforming the body of a wrist pin.

Fig. 2 is a side elevation, with parts shown in section, of the body ofa wrist pin with the head removed.

Fig. 3 is a perspective View of a length of rectangular stock used toform the head of the wrist pin.

Fig. 4 is a fragmentary elevational view of the body with the headapplied thereto in its l nished form.

Fig. 5 is an elevational View of the complete wrist pin furnished with ahead of the form shown in Fig. 4.

Fig. 6 is a fragmentary elevational view of 15 the body with a firstmodified form of head.

Fig. 7 is` a perspective View of a length of cylindrical stock used toform a second modified form of head.

Fig. 8 is a fragmentary elevational View of a 20 modified form of bodyfor receiving a third modified form or" head.

Fig. 9 is a plan view of a third rnodied form` of head.

Referring now to the drawing, a piece of cylindrical stock I, as shownin Fig. 1, is cut to the length of the finished wrist pin and forms thebody 2 of the wrist pin. The body 2 is fur nished with a peripheralgroove 3 of rectangular cross section, near one end of the body, and

with a cross bore ll, near the other end of the body, for receiving aretaining Cotter` pin 5.

For lubricating the outer surface oi the body 2 of the pin, a peripheralgroove 6 is formed in the body, and is is connected by means of a 3Dcross Ibore l, with a longitudinal axial bore 8, terminating at the headend o1" the body in an enlarged threaded opening 9, for receiving thenozzle Ill of a grease gun or other lubricating means, whereby lubricantcan be forced to the outer surface of the pin body.

The head of the wrist pin in one form of this invention is formed of apiece of rectangular stock Il, cut to length as shown in Fig. 3, andsubstantially equal to the diameter of groove 3.

In another form the piece of stock l-l can be circular in cross sectionas shown in Fig. 9.

The material forming the pieces of stock ll and I4 are rather resilientand, as illustrated in Fig. 9 with regard to the piece of stock I4 ofcircular cross-section, these pieces of stock are formed into rings bypressing or manipulating in any desired manner so as to form a separatering such as shown in Fig. 9, with the ends practically abutting. Thisring, as I6, of Fig. 9, is

Cil

then sprung open, slid over the end of the body portion, and thenallowed to snap into place in the groove in the body portion, theresiliency of the material used to form the ring being sufficient tocause the head to firmly embrace the body, sc that ordinarily no furthermeans is necessary for holding the head in place on the body.

In a manner as shown in Fig. 6, if conditions Warrant, the ends 52 ofthe heads formed by members It and 55, can be spot-Welded or otherwiseconnected together, in order to form a continuous head member, as at I3,as, for example, as shown in this Fig. 6 in connection with a. head ofrectangular cross section.

The various above forms of wrist pins all constitute wrist pins whichare rugged and simple in construction, cheap to manufacture, andefficient and long lived in operation.

The above rather specific description of various forms of thisinvention, are given solely by Way of illustration, and are notintended, in any manner whatsoever, in a limiting sense. Obviously, theinvention can assume various different physical forms, and issusceptible of numerous modications, and all such forms andmodifications, as come Within the scope of the appended c1aims, areintended to be covered by this application.

Having described the invention, it is now claimed:-

1. The method of making Wrist pins, compris- 5 ing, cutting a piece ofcylindrical stock to length, forming a peripheral groove near one end ofsaid piece, forming a split ring, of resilient material, and of aninternal diameter equal to that of the root of said groove, and anexternal di- 10 ameter greater than that of the stock, springing saidring into said groove, and spot Welding the ends of said split ring.

2. The method of making wrist pins and the like, comprising, selecting apiece of stock of 15 desired length, forming a peripheral groove in saidpiece of stock, forming a split ring of a shape complementary to thecross section of the piece of stock, of resilient material and of innerdimensions substantially equal to that of said 20 groove, and anexternal diameter greater than that of the stock, springing said ringinto said groove, and spot Welding the ends of the ring.

BEATRICE A. BANNER, g5 Eecutri of the Estate of Frank H. Banner,

Deceased.

